#region Licence
// Copyright (c) 2008 Tasman Logic Ltd

// Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
// and associated documentation files (the "Software"), to deal in the Software without restriction, 
// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all copies 
// or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;

namespace ActiveSharp.Inspection
{

    /// <summary>
    /// Represents a single MSIL instruction, consisting of an Opcode and an Operand
    /// </summary>
    public class Instruction
    {
        internal Instruction(MethodBase method, OpCode op, byte[] operandBytes)
        {
            OpCode = op;
            Operand = new Operand(method, op, operandBytes);
        }

        public readonly OpCode OpCode;
        public readonly Operand Operand;

        List<Instruction> _list;
        int _index;

        public Instruction Offset(int offset)
        {
            return _list[_index + offset];
        }

        /// <summary>
        /// Adds instruction to list
        /// </summary>
        /// <remarks>remember the list and our position in it, so that we can use it in the Offset method</remarks>
        internal void AddToList(List<Instruction> instructionList)
        {
            _list = instructionList;
            _index = instructionList.Count;
            instructionList.Add(this);
        }
    }
}
